Piston ring snagging machine



March 21, R A H G PISTON RING SNAGGING MACHINE Filed July 15, 1927 2Sheets-Sheet l March 21, 1933. R. A. HAEGG I PISTON RING SNAGGINGMACHINE Filed July 15, 2 Sheets-Sheet 2 \thtviwixks -50- Figure 1 is afront 'Vi Patented Mar. 21, 1933 cm'rm norms. mac, or nooks-01m;K111111018; ASSIGNOR' TO'BURD HIGH corrrnnssron i .mne com my, ornoexronn; rumors; A CORPIOBATION'DE. rumors,

' fish-ma sire"- since-ri e macaw-a This invention relates generally togrim}: ing machines but has particular reference we machine for snaggingpiston rings mu'ch morej economically and expeditiously than was '8heretofore possible. 1

'Cast piston rings cannot be machined be: fore the very hard and brittlesca le has been removed. This scale is usually ground 'ofi andinthe past this operation has involved considerable expense as each ringhad to be chucked for presentation to the grinder} I have found that theelimination of the chucking step greatly increases production,- enablesthe use of relatively unskilled labora'n'd; by reason of these.facts,'c'onsiclerably reduces the manufacturing cost. V

In the present case,'the rings are simply fed into the grinding positionin front of the grinding face and are engaged oneby one by'an improvedmeans of my invention which serves to press the rings against thegrindingface' and simultaneously torot'ate the same sdth'at theperipheries of the rings are ground uniformly. The means comprises apair of rollers mounted on a head movable" toward; and away from thegrinder the rollers being} provided with gears meshing with a gearonadriven'shaft j ourn'aled i'n the head forlcom municating-rotation toboth rollers in'the' 30 same direction. The rings are grippedby therollers in the mere act ofr'noving the headtoward the grinder and theringsarelike'wi'se released in the mere act of withdrawing the head.Thus, the chucking operationis dispensed with and it is unnecessary for'the operator to pick up' and handleeach ring separately as .was themethod. i r

-A special feature of the dev-ice' of in- 4 vention lies in theuniversal adjustability thereof to accommodate various sized" rings:

The rollers which engage the piston rings peripherally, are both mountedfor adjust V ment on a radius to bebrought fartherapart or closer,together accordingly asthe rings to be snagged are larger or smaller in'dianreter. -1

. The mvent on panymg drawings whereindisclose" the roller" drive;

case with the old is illustrated in the" accom scale:

ew of my machinerjrag fs eaa' aa. marge onlythe important partstherofbeing inns: traced and the'he'ad being shown-in section t Fig. Qisa plan view ofFig-fil-with certain parts appearing 'in horizontaljsectionin the pl ane oftheline 2 2 ofFig'. 1; Fig. 3is a plan view of'ahead ofinodified or alternative constructionwhich enables adsustm'entofthe rollers toward and away from i one anothertd-accoinmodate" difierent' Sizer r w d Fig. 4' is a central verticalsection through rig'ia w Thesame or s'iinilar referencf numerals are.

applied to corresponding parts throughout 'theviews'. fl The machine;comprises a work table or' other suitable support 5 onthe frame ofthemachine disposed in a hori zontaljposition front of the; grinding face 6provided on the grinding"Wheel 7. The latter'jis also carried on'theframe of'the machine and turns-in the a V directionof the arrow apearing in 'Fig; 1 in a plane substantially at right angles to the Worktable 5. The table 5 has a stack of rings 8 received in a holder 9 atone endthereof; A reciprocable slide"10jenters' be neath the stack-toexpel the lowermost ringf toapositi'on beneath-a guide 11 and betweenguides 12 and 13. Tl'ius,'the'rings are fed one by" oneto the grindingposition at one end of thetab'le and after the grinding op erationaredischarged down the incline 14' onto-a rod or into areceptacle placed tore -g ce'ivethesame. According tomy invention a" workhold ing device,indicated generally by the reference numeral f5, is'provided at" thegrinding position for releasal'ily engagin'g therings one by one astheycome'in'to position,- the said device being arranged, to press therings against the grinding face the manner indicated in Fig. 2, and atthe. same time communicate rotation thereto] as indicated by the arrowinthe same figure, s01 that theentire fperiphery"of" the ring is groundto a uniform I extent suflicient to re move the fioughandvery hardand-brittle he *evice 15 comprises a pair ofr'ollers' "16"-,preferablyio-frubber, for friction drive purposes, and arranged toengage the ring at circumferentially spaced points as shown. Theserollers have the stems 17 thereof j ournaled in a housing member 18which therefore constitutes a head or carrier arranged to be movedmanually; or otherwise. ,Pinions 19 are provided on: the stem 17 withinthe housing 18 andmesh with a pinion 20 provided on a driven shaft 21also journald in the housing 18. The shaft 21, unless itl'has itsdriving means movable with 'the head, may be a flexible shaft to permitback and forth movement of the head relative to the driving means or mayhave universal j oint. driving connection to permitof such opera tion;Obviously, the rollers 1.6.aredriven in the same. direction asindicated; byrthe ar rows in Fig. 2 when the'shaftj21 is driven in,

V the direction of thearrow shown in Fig. 1.

Provision may be ,madefor; the automatic; operation of theslide l0forWardJin the Iretra'cting of. the head .so thata's each ringfisfinished another ring is brought intoposition.- The connections :foraccomplishing this operation. are not illustratedinasmuch as the samemight be of .any suitable form. -It ,willbe apparent from, the foregoingthat the present method of operation greatly facilitates theringsnagging operation-"by eliminating the necessity for the separatehandling of each ring for chucking the same, Relatively unskilled labormay be employed foroperating ajmachine made in accordance with myinvention An operator soon becomes quite proficient in the grinding ofthe rings according to the present simple method 7 and will readily turnout a far greater number of properly snagged rings-per day than couldpossibly be produced by..the old method.

Referring to Figs. 3 and 4;.wherein I have shown a device 15 ofalternative or modified: construction, it will be observed thatithe.head 18 wherein the shaft 21 is journaled has the stemsl7 of the rollers16 supported thereby on arms 22 and 23 for adjustment in an arcwith theshaft 21 as a center, as clear ingthrough' the hubs of the arms22against lyindicated in dotted lines inFig, 3., The adjustment of thearms 22 and23 manifestly.

brings the rollers 16 closer-together, as, for

example, to accommodate a ring A- of comparatively. small diameter, orbrings the roll-H ers farther apart to accommodate a ring B. ofcomparatively large diameter. .111 any positionof adjustment of the arms22 the pinions19 remain, meshed with the pinion 20' and provis on ismade; for secur ngthearms,

in any position of: adjustment, as indicated at 1 24, the meanscomprisingset screws threadthe shank portion of the headlS in relationto which the arms are swingable. It isa very simple matter to adjust therollers to the; proper; position andvto set the same in their adjusted.position." For most practical .pur-

poses the rollers 16 are set to engage the ring at points angularlydisplaced at from 90 to 120.

I claim:

' 1. A piston ring snagging machine comprising, in combination, a worksupport, a rotarygrinderturning in a plane approximately at right anglesto the work support and having a side grinding face, said support beingarranged to receive piston ring laid flat thereon with the peripherythereof presented to said sidegrinding face, a guide over "said worksupport serving to hold the piston ring fiat on the support-butpermitting turning of said ring and means for simultaneously rotatingthe ring andpressing the'periphery thereof against the grinding facecomprising a pairof driven rollers adapted for engagiing the peripheryofthe ringzat circumferem tially spaced points and to turn in the samedirection approximately in the plane of the support and theringthereomsaidrollers being mounted on and movable bodily with a headwhereby the same. are arranged to be moved toward the grinder to press-the ring againstthe same and communicate rotation.

thereto atthe same time, v r i 2. In amachine oft-he characterdescribed, arotary grinder for cross grinding the; periphery, ofrings-or other circular. pieces, a Work support extending diametricallyacross the side grinding face of the grinder, means for holding aring onsaid supportin. a fixed plane but permitting the turning thereof, and awork feedinganddriving head mova-, bletoward and away from the sidegrinding.

face of the grinder to move the rings one by.

one toward the grinding face and press the same against said face forthecross grinding of, the periphery thereof and.simultaneously; drive thesame, saidheadhaving a pair of laterally spaced rollers for engagingtheperiphery of the ring'at spacedpoints so that the ring-isheldtherebetween against lateral movementout of grind-ing position,at leastone of saidrollers being driven, said head by grinder, meansfor feedingrings over-said;

support to, one side-ofithe grinder and means movable toward and awayfrom the grinding face Ito press the rings one by; one against the facefor the cross grinding thereof, said means in addition to pressingthework against the grinder serving to rotate the same and beingarranged bythemere act of moveaway from the ing rotation to said rollers, saidrollers being ment toward the grinder to grip the work and by the mereact of movement away-from the grinder to release thesame', said meanscomprising apair of rollers rotatably mounted on a carrier movabletoward andaway from the grinder, said carrier having a driven shaftjournaled therein, a gear on said shaft and gea'rsmeshingtherewithtmounted on the rollers wherebv rotation isco-nimunicated inthe same direction to both of said rollers. g 7 H v 4. Ina machine ofthe character described a support arranged to receive a'piston ringlaidflat thereon, means for cross grinding the periphery of'said' ringwhen the same is pressed'thereto, and a head having apair' of mately atright angles tothe' work support and a guide over said supportservingitohold a ring flat on thesupp'ort while permitting turningthereof, of means for snnultaneously turning the ring and pressing thesame to-' ward the grin'derfor cross griiiding of'the periphery thereof,said means comprising'a' head movable'to'wardand away 'from, the grinderhaving a pair of rollers mounted thereon arranged to bear against theperiphery of the ring toward the grinder to press the ring against thesame, means for communicating rotation to at least one of the rollerswhereby positively to turn the ring, said roll-' ers being mounted onarms swingable with reference to the head to brmg the rollers closertogether or farther apart according to the diameter of the ringbeingsnagged, and means for securing the arms 111 ad usted positions.

' 6. In a machine of the characterdescribed, a support arranged toreceive a piston ring or the like laid fiat thereon, means for crossgrinding the periphery of said ring when the same is pressed thereto,and a headhaving a pair of rollers mounted thereon arranged to bearagainst the periphery of the ring at spaced points to press the ringagainst the grinding means and at the same time hold it against lateralmovement out of grinding po sition, a center driving gear forcommunicatmounted on arms swingable with reference to the head about thegear center to bring the rollers closer together or farther apart, gearsfor driving the rollers meshing with the centier gear and arranged inthe swingingof thearms: from one position to another tokeep-thes'a'memeshing en agement with the center gear, 'and'means forsecuringthe arms in ad: jus'te'd position.

7. In a machine of the character described," a support arranged toreceive a'p'i's'ton or the like laid fiat thereon, means forcrossgrindingthe periphery of said ring wherrthe same is pressedthereto, a work feeding and driving head movable toward and away fromthe grinding means, a driving shaft journaled therein, a center drivingg'earofi said shaft driven thereby, a pair of arms having the inner endsthereof received on ab'earing .portionon saidhead concentric-withthecen-- ter gear, said arms being swingable witliref erence to the headto' 'di fie'rent positions, means for secu-ringtheqarm's to thehead' inadjusted position, rollers mountedfor rotat tion on the outer ends ofsaid'arms and-ar ranged in the adjustment of the arms to bebroughtcloser together or farther apart and being arranged to" bearagainst the periphery of a ring to be ground, and gears for driving saidrollers carried therewith on the outer ends of said arms and meshin withthe center gear in any position of'adpistment of the arms. Y

S. In amachine of thecharacter' described adapted for peripherallygrinding [piston rings or the like, the combination with grinder,'ofmeans for confining a ring grinding pos1t1'0n,-turn1ng therinfg while-sodisposed, and pressing the turning ring into peripheral contact with thegrinder one point of the rings periphery, sa-id means iii-- eluding apairof rollers engaging the ring at 7 two points equally spacedcircumferentiall'y on either side of the point of contact,at least oneof saidrollersbeing driven to communi-s cate drive to the ring by]frictional fcontact' with the periphery thereof, and .a' pair ofseparate supports for the rollers mounted" for swingingmovementto-bringthe rollers closer together or farther apart according"to the outside diameter of the: ring to ground, whereby to maintain. apredetermined ratio between the ring di meter and the spacing oftherjol-lerssa'id supports hav:

ing means for securin the same in adjusted position to maintainfiierollers in a termined' desired spaced relation.

4 9. In a machine for peripherally grindi g circular work pieces such,as pistonirings,l.

prede-l its the combination with agrindenbf a pair.of=

spaced {drive rollers arranged to engage the circular work piece at twopoints -c i rcum ferentially spaced to'eithersideof the point; where thework pieceengages-the surface of the grinder, means for driving. one orboth rollers so they turn inthe samedirectionand a tjjth' same eripheralspeed wlierety return the work piece relative to: the s u r face o'ffl1e1 grinder for. the complete peripheral grind determined pressure toeli'ectapredeterof spaced drive rollers arranged for engagement with theperiphery of the work piece at two points: spaced circumferentiallythereof, said rollers being of compressible resilient material, such asrubber, whereby to afford a good frictional driving connectionbetweenthe rollers and the work piece when thejparts are pressedtogether, means for driving one or both rollers sothey turn in the samedirection and at the same peripheral speed whereby to .turn the workpiece relativeto the grinder for the-complete peripheral grindingthereof, and a member movabletoward and away from the grinder to pressand release a work piece with relation thereto, said device beingarranged in its forward movement to firstbring the work piece androllers into drive transmitting relation so as to insure turning of thework piece prior to its engagement with the grincL er, and said memberbeing arranged in its further movement forwardly to press the work pieceagainst the grinder with a premined desired grinding action, the saidroll -v ers being at the same time compressed where theyengage the workpiece whereby to afford the required good. frictional drive for the workpiece. i r

, 11. In amachine for peripherally grinding circular work pieces such aspiston rings, the combination with a grinder, of a member movableforwardly and rearwardly with reference to the grinder topress andrelease a work piece placed betweenthe member and the grinder, .a pairof drive rollers spaced of spaceddrive rollers carried on the othersupport arranged to engage the work piece at two pointscircumferentially spaced to either side of the point wherethe work pieceengages the surface .of the grinder, said rollers being ofcompressibleresilient material, such as rubber, whereby to afford a goodfrictional driving connection betwe'en the rollers and the work piecewhen the parts are pressed together, means for driving one or bothrollers so they turn in the same'direction and at the same peripheralspeed whereby to turn the work piece relative to the surface of thegrinder, and means for moving the movable support to bring vthe workpiece and rollers into operative relation to one another, whereby tocause the work piece to turn, and to exert pressure between the workpiece and grinder during the turning of the work piece, whereby todetermine the. extent of the grindingaction, the said rollers being atthe same time compressed where they engage thework piece whereby toafford the required goodfrietional drive for the work piece. i f

In witness of the foregoing I affix my signature.

RUDQLPH A. HAEGG. f

for-engagement with the periphery of the 7 work piece at twocircumferentially spaced points thereon, said rollers being disposed ingages the grinder,'whereby in the forward movement of the member thesaid rollers come intofengagement with 'the work piece substantiallysimultaneously, and whereby in the further forward movement of saidmember to press the work piece into engagement with the grinder, thesaid rollers exert substantially'the same pressure against the workpiece, andvme a'ns for driving one or both rollers so they turn in thesame di-

